An investigation into computational modelling of cavitation in a propeller's slipstream

Naz Yilmaz, Mahdi Khorasanchi, Mehmet Atlar

Research output: Contribution to conferencePaper

Abstract

This paper reports on the ongoing developments of cavitation modelling so far which include preliminary validation studies for simulating the performances of two benchmark model propellers: i.e. PPTC propeller with inclined shaft; and E779A propeller, in non-cavitating and cavitating conditions. The main purpose of this study is to estimate the propeller’s performance in cavitating conditions particularly developing tip vortex cavitation. The simulations in open water and cavitating conditions were carried out in uniform flow using a commercial CFD package. Firstly, the validation studies were conducted for non-cavitating condition. The comparison with the benchmark experimental data showed good agreement for the thrust and torque coefficients as well as for the open water efficiency. Next, the cavitation developed on the propeller was simulated using a numerical model based on the Rayleigh-Plesset equation. Propulsion coefficients (KT, KQ) and the cavity patterns on the benchmark propellers’ blades showed very good agreement with the experimental data. However, the tip vortices off the blades could only be traced for E779A propeller by using a new mesh refinement approach.

Conference

ConferenceFifth International Symposium on Marine Propulsion
Abbreviated titlesmp'17
CountryFinland
CityHelsinki
Period12/06/1715/06/17
Internet address

Fingerprint

Propellers
Cavitation
Vortex flow
Propulsion
Water
Numerical models
Computational fluid dynamics
Torque

Keywords

  • marine propellers
  • tip vortex cavitation
  • CFD
  • RANS
  • DES

Cite this

Yilmaz, N., Khorasanchi, M., & Atlar, M. (2017). An investigation into computational modelling of cavitation in a propeller's slipstream. Paper presented at Fifth International Symposium on Marine Propulsion, Helsinki, Finland.
Yilmaz, Naz ; Khorasanchi, Mahdi ; Atlar, Mehmet. / An investigation into computational modelling of cavitation in a propeller's slipstream. Paper presented at Fifth International Symposium on Marine Propulsion, Helsinki, Finland.8 p.
@conference{67da8b1e5cfe400caeeb60b27c20a0c6,
title = "An investigation into computational modelling of cavitation in a propeller's slipstream",
abstract = "This paper reports on the ongoing developments of cavitation modelling so far which include preliminary validation studies for simulating the performances of two benchmark model propellers: i.e. PPTC propeller with inclined shaft; and E779A propeller, in non-cavitating and cavitating conditions. The main purpose of this study is to estimate the propeller’s performance in cavitating conditions particularly developing tip vortex cavitation. The simulations in open water and cavitating conditions were carried out in uniform flow using a commercial CFD package. Firstly, the validation studies were conducted for non-cavitating condition. The comparison with the benchmark experimental data showed good agreement for the thrust and torque coefficients as well as for the open water efficiency. Next, the cavitation developed on the propeller was simulated using a numerical model based on the Rayleigh-Plesset equation. Propulsion coefficients (KT, KQ) and the cavity patterns on the benchmark propellers’ blades showed very good agreement with the experimental data. However, the tip vortices off the blades could only be traced for E779A propeller by using a new mesh refinement approach.",
keywords = "marine propellers, tip vortex cavitation, CFD, RANS, DES",
author = "Naz Yilmaz and Mahdi Khorasanchi and Mehmet Atlar",
year = "2017",
month = "6",
day = "14",
language = "English",
note = "Fifth International Symposium on Marine Propulsion, smp'17 ; Conference date: 12-06-2017 Through 15-06-2017",
url = "http://www.vtt.fi/sites/smp17",

}

Yilmaz, N, Khorasanchi, M & Atlar, M 2017, 'An investigation into computational modelling of cavitation in a propeller's slipstream' Paper presented at Fifth International Symposium on Marine Propulsion, Helsinki, Finland, 12/06/17 - 15/06/17, .

An investigation into computational modelling of cavitation in a propeller's slipstream. / Yilmaz, Naz; Khorasanchi, Mahdi; Atlar, Mehmet.

2017. Paper presented at Fifth International Symposium on Marine Propulsion, Helsinki, Finland.

Research output: Contribution to conferencePaper

TY - CONF

T1 - An investigation into computational modelling of cavitation in a propeller's slipstream

AU - Yilmaz, Naz

AU - Khorasanchi, Mahdi

AU - Atlar, Mehmet

PY - 2017/6/14

Y1 - 2017/6/14

N2 - This paper reports on the ongoing developments of cavitation modelling so far which include preliminary validation studies for simulating the performances of two benchmark model propellers: i.e. PPTC propeller with inclined shaft; and E779A propeller, in non-cavitating and cavitating conditions. The main purpose of this study is to estimate the propeller’s performance in cavitating conditions particularly developing tip vortex cavitation. The simulations in open water and cavitating conditions were carried out in uniform flow using a commercial CFD package. Firstly, the validation studies were conducted for non-cavitating condition. The comparison with the benchmark experimental data showed good agreement for the thrust and torque coefficients as well as for the open water efficiency. Next, the cavitation developed on the propeller was simulated using a numerical model based on the Rayleigh-Plesset equation. Propulsion coefficients (KT, KQ) and the cavity patterns on the benchmark propellers’ blades showed very good agreement with the experimental data. However, the tip vortices off the blades could only be traced for E779A propeller by using a new mesh refinement approach.

AB - This paper reports on the ongoing developments of cavitation modelling so far which include preliminary validation studies for simulating the performances of two benchmark model propellers: i.e. PPTC propeller with inclined shaft; and E779A propeller, in non-cavitating and cavitating conditions. The main purpose of this study is to estimate the propeller’s performance in cavitating conditions particularly developing tip vortex cavitation. The simulations in open water and cavitating conditions were carried out in uniform flow using a commercial CFD package. Firstly, the validation studies were conducted for non-cavitating condition. The comparison with the benchmark experimental data showed good agreement for the thrust and torque coefficients as well as for the open water efficiency. Next, the cavitation developed on the propeller was simulated using a numerical model based on the Rayleigh-Plesset equation. Propulsion coefficients (KT, KQ) and the cavity patterns on the benchmark propellers’ blades showed very good agreement with the experimental data. However, the tip vortices off the blades could only be traced for E779A propeller by using a new mesh refinement approach.

KW - marine propellers

KW - tip vortex cavitation

KW - CFD

KW - RANS

KW - DES

UR - http://www.vtt.fi/sites/smp17

M3 - Paper

ER -

Yilmaz N, Khorasanchi M, Atlar M. An investigation into computational modelling of cavitation in a propeller's slipstream. 2017. Paper presented at Fifth International Symposium on Marine Propulsion, Helsinki, Finland.